The intense level of detail in preparation for this sick rampage is the work of someone with a socially removed INTENSE hated for humans.

his brother also called him "developmentally disabled", i am sorry but developmentally disabled=Asperger's, FULL retards don't have the mental capacity to go COD mode killing 25 people, so-called social reject ASSberger suffers DO. Adlof hitler was rumoured to have ASSbergers,go figure.......

His mother didn't take any action earlier because she thinks it is all part of his eccentric socially crippled loser syndrome...

I hope the monster rots in hell for what he has done to those innocent children,